This alert expired on 3 September 2026 at 21:30 UTC. It is kept here as a record.
It is the 10th strongest of the 24 detections recorded within 20 km of this point since 3 April 2026. The last comparable one was on 4 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 3:42PM CDT until September 3 at 4:30PM CDT by NWS Grand Forks ND
Nearby, since 3 April 2026
- June 30, 2026 · score 28 · 23.2 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 70 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 70% |
| Coordinates | 47.8598, -95.5317 |
| Nearest City | Grand Forks (112 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T20:42:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.f4bd4e055ac26db4711b25e7a37530990a253152.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Beltrami, MN; Clearwater, MN; Marshall, MN; Pennington, MN; Roseau, MN; Becker, MN; Clay, MN; Clearwater, MN; Mahnomen, MN; Norman, MN; Polk, MN |
| Headline | Severe Thunderstorm Warning issued September 3 at 3:42PM CDT until September 3 at 4:30PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T16:30:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f4bd4e055ac26db4711b25e7a37530990a253152.001.1","noaa_urn:oid:2.49.0.1.840.0.bbc241d5ee731bf9014be12ccceebff8a0503757.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 59 |
| Spc Location | 2 NW Fosston |
| Spc County | Polk |
| Spc State | MN |
| Spc Comments | Personal weather station via Mesotech. (FGF) |
| Iem TypeSummary | D |
| Iem City | 3 SE Mcintosh |
| Iem County | Polk |
| Iem State | MN |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.